Valve-stem adapter for inner-tube molds



Dec. 11, 1928. 1,695,013

A. A. GLIDD4EN arm.

VALVE STEM ADAPTER FOR INNER TUBE HOLDS Filed Sept. 50. 1927 Patented Dec. 11, 1928.

UNITED STATES ,PATENT ori ce.-

ALFRED A. GLIDDEN AND THOMAS M. KNOWLANID, oswAT'nRTowrr, AND mum T.

men, .13., or NEWTON, MASSACHUSETTS, ASSIGNORS To noon RUBBER contrary, or WATERTOWN, MASSACHUSETTS; A' CORPORATION or MASSACHUSETTS. f I

' -vALvE-STEM ADAPTER FOR iNNEZB-IUZBE moLns.

Application filed September 30, 1927. Serial 170.2%,083;

. This invention relates to a valve stem adapter for inner tube molds.

The object of the invention is to provide a device which will encircle and interlock with l the valve stem of an inner tube, and also be so associated with'the mold for said inner tube at the pointwhere the valve stem passes outwardly therethrough that the material of' which the'inner tube is constructed will not .flow around the valve stem during the vulcanizing operation, thereby clogging the threads of the valve stem and making it necessary to remove'the material from the mediately surrounding the valve stem and known as the valve base is preventedfrom leaking out around the valve stem, which would weaken the portion of the tube immediately adjacent to the valve stem. The tube, by the use of our adapter isthus left of'its original form and thickness and strength.

=..The invention'consists in a mold and valve stem adapter. therefor as set forth in the fol-' lowing specification and particularly as pointed out in the claims thereof.

Referring to the drawings:

Figure 1 represents a plan view of a mold for an inner tube and valve stem adapter therefor embodying our invention.

Fig. 2 is an enlarged transverse section.

through the mold as taken on the line 2-2 of Fig. 1, an inner tube and valve stem adapter 4 flange'22 of the valve stem and the extremity being illustrated in position within the mold. Fig. 3 is a detail section taken on the line 33 of Fig. 2.' Fig.4 is a side elevation of the adapter. Like numerals refer to like parts through out the several-views of the drawings.

In the, drawings, 5 is an annular tubular mold for an innertube 6, said mold oons1st--' ing of two semi-tubular sections 7 and 8 fhinged together at 9. The section 'l has'an outer flange 10 extending therearound and an inner flange 11 also extendin therearound. The section 8has an outer ange 12 and an inner flange 13 extending therearound.

The inner tube 6 is'provided with an air valve stem 14 of well-known construction, and when theinner tube is in position within the mold the valve stem 14, projects mto and adapter of, this invention.

.within the recess .19 of the mold section 8.

.gg through, a sleeve 15 which constitutes the The sleeve 15, in addition to projecting" through an opening provided therefor in the mold section8, is held securely inposition upon the flange 13 of said mold section by a cap 16,-the latterbeing fastened to the said flange by screws 17 The sleeve 15 has a tapered head portion 18 formed at one end thereof, said head portion fitting a correspondingly tapered recess 19 provided in the mold section 8. The sleeve 15 is rotatable B5 within the mold section 8 and may also slide longitudinally thereof within said mold sec tion, said longitudinal movement being limited in one direction by the head portion 18. The sleeve 15 has a bore 20 extending. partly therethrough, said bore terminating in aninternally screw-threaded portion 21 which has screw-threaded engagement with the valve stem 14, so that by rotating the sleeve 15,: the valve stem can be drawn into the sleeve 15, thus bringingthe innerv tube 6 into contact with the inner end of the sleeve and clamping the inner tube between a. flange 22 provided upon the valve stem and the inner end-of the sleeve. A'portion of the exterior surface of the Sleeve 15 is knurled at 23 to faoilitate the manual rotation of said sleeve inner tube being tightly clamped between the of the sleeve. The. inner tube in a partially inflated condition is placed within the mold section 8 with the valve stem and sleeve pro-. jecting through: the openin provided therefor in the mold Section. The mold section 7 is then closed uponthe section 8 and clamped thereto and the inner tube then inflated, the pressure of air within the inner tube holding the latter in the position illustratedin Fig. 2 and with the head 18 of'the sleeve l5 seated The operation of vulcanizing the inner tube may'then be performed without danger of the material of which the innertube is constructed, and especially the valve base, flow ing around the valve stem 14 and clogging sary to remove said material from the threads after the inner tube is removed from the mold, and also thereby weakening that portion of the tube known as the valve base immediately ad'acent to the valve stem as here- 'inbefore set orth.

.We claim: V

1. In combination a mold, and a sleeverotatably mounted therein, said sleeve being constructed and arranged to encircle and to have screw-threaded engagement with the valve stem of an inner tube located within said mold vto clamp said inner tube to the sleeve.

' 2. In combination a mold, and a sleeve rotatably mounted therein, said sleevebeing constructed and arranged to have screw-' threaded engagement with the valve stem of an inner tube located within said mold to clamp said inner tube I to the sleeve the sleeve clamp said inner tube to the sleeve, the sleeve also being slidable longitudinally thereof within the mold and being provided with a head portion'engaging the mold and limiting said longitudinal'movement in one direction.-

In testimony whereof we have hereunto set our hands.

ALFRED A. GLIDDEN. THOMAS KNOWLAND. WILLIAM T. RICH, JR. 7 

